Number formatter

The number formatter enables you to passively apply custom formatting to numbers (int and float) when printing text.

Functions

Each scope maintains its own separate number format. To change the number format options, you need to use the [num-fmt*] class of functions.

The following functions are available:

Function	Desctipyion
`[num-fmt]`	Set multiple format options at once or get a map of all format options
`[num-fmt-system]`	Get or set the current numeral system
`[num-fmt-alt]`	Get or set the alternate formatting flag
`[num-fmt-precision]`	Get or set the decimal precision
`[num-fmt-padding]`	Get or set the padding size for the integral part of the number
`[num-fmt-upper]`	Get or set the uppercase formatting flag
`[num-fmt-endian]`	Get or set the endianness for bytewise representations (hex, binary, etc)
`[num-fmt-sign]`	Get or set the sign style
`[num-fmt-infinity]`	Get or set the infinity style
`[num-fmt-group-sep]`	Get or set the group separator
`[num-fmt-decimal-sep]`	Get or set the decimal separator

Options

The below table describes each option available in the number formatter.

Name	Type	Default	Description
`system`	`string`	`west-arabic`	Numeral system to render numbers in (See associated table)
`alt`	`bool`	`false`	Enables alternate formatting for the selected system
`precision`	`int`	`-1`	Number of decimal places to pad/truncate to; set to -1 to disable
`padding`	`int`	`0`	Minimum number of digits to pad the integral component to
`upper`	`bool`	`false`	Enables current system's uppercase form
`endian`	`string`	`big`	Byte order for power-of-two bases (hex, binary...). (See associated table)
`sign`	`string`	`negative-only`	Sign formatting style (See associated table)
`infinity`	`string`	`keyword`	Infinity formatting style (See associated table)
`group-sep`	`string`	`""`	Digit group separator
`decimal-sep`	`string`	`""`	Decimal group separator; if not specified, defaults to `"."`

The `system` option

Value	Description	Example (1234)
`default`	(Set-only) Same as `west-arabic`	1234
`west-arabic`	Western Arabic numerals (default)	1234
`east-arabic`	Eastern Arabic numerals	١٢٣٤
`persian`	Persian numerals	۱۲۳۴
`babylonian`	Babylonian cuneiform numerals. Truncates decimals.	𒌋𒌋 𒌍𒐘
`roman`	Roman numerals. Truncates decimals.	mccxxxiv
`hex`	Hexadecimal (base 16); Floats use IEEE 754 double-precision format.	4d2
`octal`	Octal (base 8); Floats use IEEE 754 double-precision format.	2322
`binary`	Binary (base 2); Floats use IEEE 754 double-precision format.	10011010010
`alpha`	Latin alphabetical ordinals; identical to Excel column numbers	aul

The `endian` option

Value	Description
`default`	(Set-only) Same as `big`
`big`	Specifies big-endian byte order (MSB goes first) (default)
`little`	Specifies little-endian byte order (LSB goes first)

The `sign` option

Value	Description
`default`	(Set-only) Same as `negative-only`
`negative-only`	Show a minus on negative numbers; otherwise, nothing.
`explicit`	Show a plus on positive numbers (including zero), and a minus on negative numbers.
`explicit-non-zero`	Show a plus on positive numbers, nothing on zero, and a minus on negative numbers.

The `infinity` option

Value	Description
`default`	(Set-only) Same as `keyword`
`keyword`	Uses `-infinity` for negative infinity and `infinity` for positive infinity.
`symbol`	Uses `-∞` for negative infinity and `∞` for positive infinity.

Using [num-fmt]

The [num-fmt] function is the simplest way to configure complex formats. It enables you to set multiple options at once, or get a map of all current option values.

Getting current options with [num-fmt]

To get a map of all number format options, just call [num-fmt] and omit the options parameter:

[num-fmt]

This prints a map with the following fields:

(::
    sign = negative-only; 
    infinity = keyword; 
    group-sep = ; 
    endian = big; 
    precision = -1; 
    system = west-arabic; 
    alt = false; 
    padding = 0; 
    upper = false; 
    decimal-sep = ;
)

This can be stored in a variable for later use, or modified and passed back into the function.

Setting options with [num-fmt]

To set options, pass a map to [num-fmt] with the fields you're interested in changing. This will overwrite only the specified options, leaving all others unchanged.

# Format numbers as 64-bit hex with 0x prefix
[num-fmt: (:: system = hex; alt = @true; padding = 16)]
1000000000\n

# Change another option
[num-fmt-endian: little] 
1000000000\n

This produces the output:

0x000000003b9aca00
0xca9a3b0000000000

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